A study is to be conducted on the mean salary of mayors of cities with a population of fewer than 100000. The error in estimating the mean is to be less than 100 birr and confidence level of 95% is desired. Suppose that is the standard deviation of the population is estimated to be 1000birr. What is the required sample size?

Mike and his wife, amanda, are arguing about his in-laws. mike doesn’t want them to visit because they fight all the time when they come to the house and he is worried about the effect that their fighting is having on mike and amanda’s children. amanda finally yells out: “what about our fighting? ” mike replies, “well, that’s different. we fight because we’re having a disagreement, they fight because they hate each other! ” this is an example of